We currently use smart cards that have our digital signatures and would like to have this transferred or be able to use on a mobile device. Our forms currently require digital signatures, however, the person can't view the form (created in Livecycle designer ES2) from the mobile phone, therefore we need to upgrade to ES4. Will we be able to use our current signatures using mobile, without having to use a signature created from Adobe?
LiveCycle ES4 has Mobile Forms module which actually capable of rendering your existing XFA based forms as HTML5 based form which could be opened on Mobile devices as well.
Mobile Form has Scribble signature for Mobile devices, the digital signature is not supported on Mobile devices.Check this : http://helpx.adobe.com/livecycle/topics/mobile-forms-dev.html